Ark Raider is one of the three skins released in the thrid part of the Ark Raider's Mystical Shop offer. It could be purchased as part of an item deal in late September 2018.
Ark Raider could be purchased for $14.99 in the limited time "Best Deal!" which included 25000 coins, 1200 DNA, a Triple XP Boost and a Double Mass Boost. This skin was not available for individual purchase and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: The third part of the Ark Raider's Mystical Shop offer was released again for a limited time in late March 2020. The included items and amounts as well as the price for Ark Raider remained the same.